How to shoot air targets?

The Academy - Players helping Players
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1

(Start at 1:53) I would love if anyone could help become a pro with this. Thank You!

2

He’s using proxy shells

3

like He-Shells or HEAT Shells?

4

image

5

They’re HE shells that detonate when they get close to an object, e.g planes.

6

Or literally any other solid enough object so gotta have a fairly clear line of sight to the plane